TECHNICAL FIELD
[0001] Embodiments of the present invention relate to communications technologies, and in
particular, to a receiving device and an optical switching fabric apparatus.
BACKGROUND
[0002] Currently, an Optical Switching Fabric (Optical Switching Fabric, OSF for short)
refers to an internal switching network of a router, a switch, an Optical Transport
Network (Optical Transport Network, OTN for short) switching device, and the like.
Generally, for ease of description, the OSF is divided into an optical switching matrix
(Optical Switching Matrix, OSM for short) part for completing a switching function,
and a control part for implementing switching scheduling or control.
[0003] A mainstream manner for supporting small-granularity switching in the OSM is still
a time division switching (Time Division Switching, TDS for short) manner. The TDS
includes using of an optical burst (Optical Burst, OB for short), an optical packet
(Optical Packet, OP for short), or an optical cell (Optical Cell, OC for short). The
so-called time division switching refers to a switching manner in which time is divided
into several non-overlapping timeslots, different subchannels are established by using
different timeslots, and service data is transmitted from an input point to an output
point by using a timeslot switching network.
[0004] In a time division switching system, a switching speed of an optical component in
the OSM determines a switching granularity. The switching speed of the optical component
determines an interval length between optical bursts, and to ensure a specific bandwidth
utilization rate (for example, to ensure a physical bandwidth utilization rate of
90%, an optical burst length must be about 10 times the interval length between the
optical bursts), this also restricts the optical burst length, which thereby determines
the switching granularity.
[0005] A finest switching granule may exist in a switching network of a routers or a switch,
which generally requires implementation of switching at a granularity of a 64-byte
cell (Cell). If an optical switching fabric apparatus is to be introduced to a router
or a switch, the following is required:
In a case in which an interconnection line speed is 10Gbps (Gbps, 109 bits per second), a switching granularity length (temporal) is: 64Bytes×8/10Gbps≈50ns
(ns, 10-9 second); and to ensure a relatively high bandwidth utilization rate (assuming that
the switching granularity length is 10 times the interval, the physical bandwidth
utilization rate is greater than 90%), an optical burst interval is 5ns.
[0006] In a case in which an interconnection line speed is 25Gbps, the switching granularity
length is 20ns, and the optical burst interval is 2ns.
[0007] However, another requirement of the optical switching fabric apparatus used in a
router or a switch is a capacity. With rapid growth of user traffic, a greater capacity
of the optical switching fabric apparatus is also required.
[0008] Therefore, how to design an optical switching fabric apparatus with a large capacity
and a relatively fast switching speed becomes an issue to be urgently solved currently.
[0009] EP 0 310 058 A2 discloses a wavelength division switching system comprising wavelength selectors
configured for selecting desired wavelength channels of a multiwavelength signal that
are provided to optical gates. The optical gates are coupled to optical switches and
delay lines so that the optical signals outputted by the wavelength selectors may
be transmitted with or without a delay depending on delay control signals supplied
by a controller.
SUMMARY
[0010] For the disadvantage in the prior art, embodiments of the present invention provide
a receiving device and an optical switching fabric apparatus.
[0011] According to a first aspect, an embodiment of the present invention provides a receiving
device, including:
at least two selecting modules, a fast optical switch connecting to each selecting
module, an output module connecting to all fast optical switches, and a receiver connecting
to the output module, where
the selecting module is configured to receive a multiwavelength optical signal, filter
a first optical signal of a set time segment from the multiwavelength optical signal,
and send the first optical signal to the fast optical switch;
the fast optical switch is configured to select a second optical signal from the first
optical signal filtered by the selecting module, and send the second optical signal
to the output module;
the output module is configured to combine the second optical signals separately selected
by all the fast optical switches into one optical burst signal, and send the optical
burst signal to the receiver; and
the receiver is configured to perform optical-to-electrical conversion on the optical
burst signal to obtain an electrical signal, extract service data from the electrical
signal, and output the service data; wherein
the first optical signals separately output by the at least two selecting modules
partly overlap in the time; and
the second optical signals output by at least two fast optical switches do not overlap
in the time..
[0012] With reference to the first aspect, in a first optional implementation manner, the
at least two selecting modules are disposed in a serial manner.
[0013] With reference to the first aspect, in a second optional implementation manner, the
method further includes: an input module, where
the input module is separately connected to the at least two selecting modules; and
the input module is configured to receive a multiwavelength optical signal sent by
a wavelength broadcasting device in the optical switching fabric apparatus, split
the multiwavelength optical signal into multiple multiwavelength optical signals,
and input each multiwavelength optical signal to a corresponding selecting module,
where the number of multiwavelength optical signals is the same as that of the selecting
modules.
[0014] With reference to the first aspect and the second optional implementation manner,
in a third optional implementation manner, the at least two selecting modules are
disposed in a parallel manner.
[0015] With reference to the first aspect and the second and the third optional implementation
manners, in a fourth optional implementation manner, the input module is a one-input
multi-output splitter.
[0016] With reference to the first aspect and the foregoing possible implementation manners,
in a fifth optional implementation manner:
the output module is a multi-input one-output combiner.
[0017] With reference to the first aspect and the foregoing possible implementation manners,
in a sixth optional implementation manner:
the selecting module is a microring.
[0018] With reference to the first aspect and the foregoing possible implementation manners,
in a seventh optional implementation manner, the method further includes:
a receiving clock generating module, where
the receiving clock generating module is configured to generate an optical burst frame
header clock that is to be used by the selecting module and the fast optical switch,
so that the receiving device is synchronous with an optical burst frame header clock
sent by a sending device in the optical switching fabric apparatus; and
the receiving clock generating module is separately connected to each selecting module,
and the receiving clock generating module is separately connected to each fast optical
switch.
[0019] With reference to the first aspect and the foregoing possible implementation manner,
in an eighth optional implementation manner, the receiving device includes a first
selecting module and a second selecting module, a first fast optical switch connecting
to the first selecting module, and a second fast optical switch connecting to the
second selecting module;
correspondingly, when the first selecting module is connected to the second selecting
module in parallel, the first selecting module splits, from the multiwavelength optical
signal, an optical signal 1 corresponding to a time segment 1, and
the second selecting module splits, from the multiwavelength optical signal, an optical
signal 2 corresponding to a time segment 2;
when the first selecting module is connected to the second selecting module in series,
the first selecting module splits, from the multiwavelength optical signal, the optical
signal 1 corresponding to the time segment 1, and sends the remaining optical signal
to the second selecting module, and the second selecting module splits, from the remaining
optical signal, the optical signal 2 corresponding to the time segment 2;
the optical signal 1 partly overlaps with the optical signal 2 in the time, the optical
signal 1 at least completely includes an optical signal 3 on a selected wavelength
1 and in a selected timeslot 1, the optical signal 2 at least completely includes
an optical signal 4 on a selected wavelength 2 and in a selected timeslot 2, and the
optical signal 3 does not overlap with the optical signal 4 in the time;
the first fast optical switch splits the optical signal 3 from the optical signal
1, and the second fast optical switch splits the optical signal 4 from the optical
signal 2; and
the output module combines the optical signal 3 and the optical signal 4 into one
optical burst signal and outputs the optical burst signal to the receiver.
[0020] According to a second aspect, an embodiment of the present invention provides an
optical switching fabric apparatus, including:
a sending device, a wavelength broadcasting device, and the receiving device, where
the sending device is configured to receive an electrical signal that includes service
data, convert the electrical signal into an optical signal by using a preconfigured
wavelength, and send the optical signal to the wavelength broadcasting device;
the wavelength broadcasting device is configured to send the optical signal to the
receiving device; and
the receiving device is configured to acquire service data in the optical signal and
output the service data.
[0021] With reference to the second aspect, in a first optional implementation manner, the
apparatus further includes:
a clock source and a scheduling module, where
the clock source is connected to the scheduling module, the scheduling module is connected
to the wavelength broadcasting device, and the clock source is configured to generate
a synchronous clock source of the optical switching fabric apparatus; and
the scheduling module is configured to perform dynamic scheduling on the optical signal
of the sending device, and configured to perform selection and reception, by the selecting
device, in a timeslot specified by the scheduling module.
[0022] With reference to the second aspect, in a second optional implementation manner,
the sending device includes:
a transmitter, configured to convert an electrical signal into an optical signal.
[0023] With reference to the second aspect and the first optional implementation manner,
in a third optional implementation manner, the sending device includes:
a transmitter configured to convert an electrical signal into an optical signal; and
a sending clock generating module, configured to track the synchronous clock source
generated by the clock source, and generate a data clock that needs to be sent by
the transmitter and an optical burst frame header clock that needs to be sent by the
transmitter.
[0024] With reference to the second aspect, in a fourth optional implementation manner,
the wavelength broadcasting device includes:
a combiner, an optical amplifying unit, and a first splitter, where
the combiner is configured to receive optical signals sent by the at least two sending
devices, combine the received optical signals to form the multiwavelength signal,
and send the multiwavelength signal to the optical amplifying unit;
the optical amplifying unit is configured to receive the multiwavelength optical signal
sent by the combiner, amplify the multiwavelength optical signal, and send an amplified
multiwavelength optical signal to the first splitter; and
the first splitter is configured to split the optical signal sent by the optical amplifying
unit into multiple optical signals, and send each optical signal to a corresponding
receiving device.
[0025] With reference to the second aspect and the first optional implementation manner,
in a fifth optional implementation manner, the wavelength broadcasting device includes:
a combiner, an optical amplifying unit, a first splitter, and a second splitter, where
the combiner is configured to receive optical signals sent by the at least two sending
devices, combine the received optical signals to form the multiwavelength signal,
and send the multiwavelength signal to the second splitter;
the second splitter is configured to split the multiwavelength optical signal sent
by the combiner into two optical signals, where one multiwavelength optical signal
is sent to the optical amplifying unit, and the other multiwavelength optical signal
is sent to the scheduling module of the optical switching fabric apparatus;
the optical amplifying unit is configured to send, to the first splitter, the multiwavelength
optical signal sent by the second splitter; and
the first splitter is configured to receive an optical signal sent by the scheduling
module and the multiwavelength optical signal of the optical amplifying unit, split
the optical signal of the scheduling module and the multiwavelength optical signal
sent by the optical amplifying unit into multiple multiwavelength optical signals,
and send each multiwavelength optical signal to a corresponding receiving device.
[0026] It can be known from the foregoing technical solutions that, in the receiving device
and the optical switching fabric apparatus in the embodiments of the present invention,
multiple selecting modules, a fast optical switch connecting to each selecting module,
an input module connecting to all fast optical switches, and a receiver connecting
to the input module are disposed in the receiving device; therefore the optical switching
fabric apparatus that includes the receiving device can solve a problem in the prior
art that a capacity of an optical switching matrix is small or a switching speed cannot
meet a requirement.
BRIEF DESCRIPTION OF DRAWINGS
[0027] To describe the technical solutions in the embodiments of the present invention more
clearly, the following briefly introduces the accompanying drawings required for describing
the embodiments. Apparently, the accompanying drawings in the following description
show some embodiments of the present invention, and persons of ordinary skill in the
art may still derive other drawings from these accompanying drawings without creative
efforts.
FIG. 1 is a principle diagram of an FTL and c-AWG in the prior art;
FIG. 2A is a schematic structural diagram of a receiving device according to an embodiment
of the present invention;
FIG. 2B is a schematic structural diagram of a receiving device according to another
embodiment of the present invention;
FIG. 2C is a part of a schematic structural diagram of a receiving device according
to an embodiment of the present invention;
FIG. 2D is a part of a schematic structural diagram of a receiving device according
to another embodiment of the present invention;
FIG. 2E is a schematic diagram of a synchronous clock source according to an embodiment
of the present invention;
FIG. 3A is a schematic structural diagram of an optical switching fabric apparatus
according to an embodiment of the present invention;
FIG. 3B is a schematic structural diagram of an optical switching fabric apparatus
according to another embodiment of the present invention;
FIG. 3C is a schematic structural diagram of an optical switching fabric apparatus
according to another embodiment of the present invention;
FIG. 3D to FIG. 3G are schematic structural diagrams of an optical switching fabric
apparatus according to another embodiment of the present invention;
FIG. 4A and FIG. 4B are separately schematic diagrams of a single-wavelength optical
signal according to an embodiment of the present invention;
FIG. 5A is a schematic structural diagram of a wavelength broadcasting device in an
optical switching fabric apparatus according to an embodiment of the present invention;
FIG. 5B is a schematic structural diagram of a wavelength broadcasting device in an
optical switching fabric apparatus according to another embodiment of the present
invention; and
FIG. 5C is a schematic structural diagram of a wavelength broadcasting device in an
optical switching fabric apparatus according to another embodiment of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0028] To make the objectives, technical solutions, and advantages of the present invention
clearer, the following clearly and completely describes the technical solutions of
the present invention with reference to the accompanying drawings in the embodiments
of the present invention. Apparently, the following described embodiments are a part
of the embodiments of the present invention. Based on the embodiments of the present
invention, persons of ordinary skill in the art can obtain other embodiments that
can solve the technical problem of the present invention and implement the technical
effect of the present invention by equivalently altering some or all the technical
features even without creative efforts. Apparently, the embodiments obtained by means
of alteration do not depart from the scope disclosed in the present invention.
[0029] In the prior art, a semiconductor optical amplifier (Semiconductor Optical Amplifier,
SOA for short) optical switch is used to set up an optical switching fabric apparatus.
A switching speed of an SOA is relatively fast and can reach a ps (ps, 10
-12 second) level. However, the optical switching fabric apparatus set up by using the
SOA is at a relatively poor integrated level.
[0030] At present, a largest scale of an SOA optical switch module for commercial use is
8x8 (namely, 8 inputs and 8 outputs). If a one-level switching architecture is used,
the optical switching fabric apparatus set up by using the SOA optical switch has
a relatively small scale, which can only implement an 8x8 scale; and if a multi-level
switching architecture is used, the number of required SOA optical switch modules
is excessively large, resulting in a relatively large volume and relatively large
power consumption (in the multi-level switching architecture, the number of required
basic switching units increases exponentially with the increase of a switching capacity).
[0031] Therefore, in the industry, a fast tunable laser (Fast Tunable Laser, FTL for short)
with cyclic array waveguide gratings (cyclic Array Waveguide Gratings, c-AWG for short)
is used to set up the optical switching fabric apparatus.
[0032] A main characteristic of the c-AWG is that different wavelength signals input through
a same input port can be output through different output ports. A principle of signal
switching implemented by the FTL plus the c-AWG is shown in FIG. 1.
[0033] In FIG. 1, the FTL modulates different signals to different wavelengths. In this
way, after the different signals go through the c-AWG, the different signals can be
output through different output ports. A lower part of FIG. 1 shows an example of
an input-output relationship of the c-AWG. Certainly, c-AWG with different input and
output features may be designed according to a requirement. However, the main characteristic
of the c-AWG is that different-wavelength signals input through a same input port
can be output through different output ports.
[0034] At present, tunable wavelengths of most FTLs reach 80 to 90 waves (corresponding
to a C band). The c-AWG can reach a maximum 80x80 scale. Therefore, in a manner of
using the FTL and c-AWG, an 80x80 scale can be reached for a basic switching unit,
so that an optical switching fabric apparatus with a large capacity can be set up.
[0035] However, setting up the optical switching fabric apparatus by using the FTL and c-AWG
has the following disadvantage: a switching speed cannot meet a requirement of cell
switching. At present, the switching speed of the FTL can generally reach only about
90ns, which cannot meet a requirement of switching a 64-byte cell in a switching time
of 2ns to 5ns.
[0036] Therefore, how to design an optical switching fabric apparatus with a relatively
large capacity and a relatively fast switching speed becomes an issue to be solved
currently.
[0037] In addition, it should be noted that an OB, an OP, and an OC that are described in
the prior art are in a similar representation form in the time, but are different
only in a duration length. In the embodiments of the present invention, for ease of
description, the OB, the OP, and the OC are all referred to as the OB, content described
in the embodiments of the present invention is applicable to the OB, the OP, and the
OC, and the like.
[0038] In the embodiments of the present invention, by mainly setting modules in a receiving
device, and an optical switching fabric apparatus that includes the receiving device,
an optical module (for example, a transmitter) that can meet an wavelength division
multiplexing (Wavelength Division Multiplexing, WDM for short) application standard
is used in a sending part of the optical switching fabric apparatus to send service
data, and multiple pieces of service data are sent to the receiving device by optical
layer broadcasting (for example, by using a wavelength broadcasting device); and the
receiving device filters, by using a fast tunable filter, required service data from
a signal sent by optical layer broadcasting, so as to achieve a reception purpose.
[0039] The fast tunable filter in the embodiments may include: a selecting module, a fast
optical switch, an output module, and the like, which are described in detail in the
following Embodiment 1.
[0040] In a specific implementation process, a fast tunable filter module uses a two-level
multi-path working mode, and the fast tunable filter may rapidly filter, from a multiwavelength
signal, a cell that needs to be received (service data is encapsulated in the cell).
Embodiment 1
[0041] FIG. 2A shows a schematic structural diagram of a receiving device according to an
embodiment of the present invention. As shown in FIG. 2A, the receiving device of
this embodiment includes: at least two selecting modules 201, a fast optical switch
202 connecting to each selecting module 201, an output module 203 connecting to all
fast optical switches 202, and a receiver 204 connecting to the output module 203.
[0042] The selecting module 201 is configured to receive a multiwavelength optical signal,
filter a first optical signal of a set time segment from the multiwavelength optical
signal, and send the first optical signal to the fast optical switch 202.
[0043] The multiwavelength optical signal is broadcast by a wavelength broadcasting device
in an optical switching fabric apparatus (namely, an output of the wavelength broadcasting
device) (it should be noted that, if multiple selecting modules 201 are connected
in series, the first selecting module is connected to the wavelength broadcasting
device, and the remaining selecting modules are connected to a previous selecting
module).
[0044] The fast optical switch 202 is configured to select a second optical signal from
the first optical signal filtered by the selecting module 201, and send the second
optical signal to the output module 203.
[0045] The output module 203 is configured to combine the second optical signals separately
selected by all the fast optical switches 202 into one optical burst signal, and send
the optical burst signal to the receiver 204.
[0046] The receiver 204 is configured to perform optical-to-electrical conversion on the
optical burst signal to obtain an electrical signal, extract service data from the
electrical signal, and output the service data.
[0047] In a specific application process, the first optical signals separately output by
the at least two selecting modules may partly overlap in the time; and the second
optical signals output by the at least two fast optical switches do not overlap in
the time.
[0048] Particularly, in FIG. 2A, the at least two selecting modules 201 are disposed in
a serial manner.
[0049] For example, if the number of selecting modules included in the receiving device
is two (for example, a first selecting module and a second selecting module), the
number of fast optical switches is also two (for example, a first fast optical switch
and a second fast optical switch), and in this case, the first selecting module in
this embodiment splits, from the multiwavelength optical signal, an optical signal
1 corresponding to a time segment 1.
[0050] The second selecting module splits, from the multiwavelength optical signal, an optical
signal 2 corresponding to a time segment 2.
[0051] The optical signal 1 partly overlaps with the optical signal 2 in the time, the optical
signal 1 at least completely includes an optical signal 3 on a selected wavelength
1 and in a selected timeslot 1, the optical signal 2 at least completely includes
an optical signal 4 on a selected wavelength 2 and in a selected timeslot 2, and the
optical signal 3 does not overlap with the optical signal 4 in the time.
[0052] The first fast optical switch splits the optical signal 3 from the optical signal
1, and the second fast optical switch splits the optical signal 4 from the optical
signal 2.
[0053] The output module combines the optical signal 3 and the optical signal 4 into one
optical burst signal, and outputs the optical burst signal to the receiver.
[0054] The receiver receives the optical burst signal output by the output module, performs
optical-to-electrical conversion on the optical burst signal, and extracts service
data 1 corresponding to the optical signal 3 and service data 2 corresponding to the
optical signal 4. It should be understood that the optical signals 1 to 4 are all
specific optical signals used as examples for description, and are not limited in
this embodiment. The first optical signal and the second optical signal that are described
above may be construed as general terms used for ease of description, where the first
optical signal includes the optical signal 1, the optical signal 2, and the like,
and the second optical signal includes the optical signal 3, the optical signal 4,
and the like.
[0055] In this embodiment, the optical switching fabric apparatus that includes the receiving
device can meet a current requirement of a router or a switch on a switching speed,
that is, the optical switching fabric apparatus that uses the receiving device can
support a relatively large capacity and a relatively fast switching speed.
[0056] In another optional embodiment, the receiving device of this embodiment may further
include an input module 205. As shown in FIG. 2B, the input module 205 is separately
connected to the at least two selecting modules.
[0057] The input module 205 is configured to receive a multiwavelength optical signal sent
by the wavelength broadcasting device in the optical switching fabric apparatus, split
the multiwavelength optical signal into multiple multiwavelength optical signals,
and input each multiwavelength optical signal to a corresponding selecting module
201, where the number of multiwavelength optical signals is the same as that of the
selecting modules 201.
[0058] The at least two selecting modules 201 in this embodiment are disposed in a parallel
manner. For example, if the receiving device includes two selecting modules, for example,
a first selecting module and a second selecting module, correspondingly, two fast
optical switches are included, for example, a first fast optical switch and a second
fast optical switch.
[0059] The first selecting module splits, from the multiwavelength optical signal that is
output by the input module 205, the optical signal 1 corresponding to the time segment
1, and sends the remaining optical signal to the second selecting module; and the
second selecting module splits, from the remaining optical signal, the optical signal
2 corresponding to the time segment 2.
[0060] The optical signal 1 partly overlaps with the optical signal 2 in the time, the optical
signal 1 at least completely includes an optical signal 3 on a selected wavelength
1 and in a selected timeslot 1, the optical signal 2 at least completely includes
an optical signal 4 on a selected wavelength 2 and in a selected timeslot 2, and the
optical signal 3 does not overlap with the optical signal 4 in the time.
[0061] The first fast optical switch splits the optical signal 3 from the optical signal
1, and the second fast optical switch splits the optical signal 4 from the optical
signal 2.
[0062] The output module combines the optical signal 3 and the optical signal 4 into one
optical burst signal, and outputs the optical burst signal to the receiver.
[0063] The receiver receives the optical burst signal output by the output module, performs
optical-to-electrical conversion on the optical burst signal, and extracts service
data 1 corresponding to the optical signal 3 and service data 2 corresponding to the
optical signal 4. It should be understood that the optical signals 1 to 4 are all
optical signals used as examples for description, and are not limited in this embodiment.
[0064] Therefore, the optical switching fabric apparatus that includes the receiving device
can meet a current requirement of a router or a switch on a switching speed.
[0065] In a specific application, the input module 205 in FIG. 2B may be a one-input multi-output
splitter, where the number of outputs of the splitter is the same as the number of
selecting modules.
[0066] The output module in FIG. 2A and FIG. 2B may be a multi-input one-output combiner,
where the number of inputs of the combiner is the same as the number of fast optical
switches.
[0067] Optionally, all the selecting modules in FIG. 2A and FIG. 2B may be microrings, for
example, microrings fabricated by using InP (InP) or a polymer (Polymer) material,
which are configured to filter any wavelength from an entire C band, and can control
a tuning time within 10ns, to match a cell length.
[0068] The fast optical switches in FIG. 2A and FIG. 2B may be implemented by using an SOA,
so as to implement a ps-level switching speed.
[0069] Optionally, in a specific application, if an interconnection line speed is further
increased, more selecting modules (for example, microrings) may be used in the receiving
device, so as to reduce a switching time of the receiving device. An example is as
follows:
If two selecting modules are used, at an interconnection line speed of 25Gbps, a switching
speed of 1ns (supporting 64-byte cell switching) can be implemented, and a physical
bandwidth utilization rate of over 90% can also be ensured.
[0070] If three selecting modules are used, at an interconnection line speed of 50Gbps,
a switching speed of 500ps (supporting 64-byte cell switching) can be implemented,
and a physical bandwidth utilization rate of over 90% can also be ensured.
[0071] In any one of the foregoing specific application examples, as shown in FIG. 2C, the
selecting module may be implemented by using a microring, and a single-wavelength
signal (for example, the first optical signal described in FIG. 2A in Embodiment 1)
may be filtered from a multiwavelength signal. (As described above, if the first optical
signals filtered by multiple selecting modules overlap in the time, start and end
parts of the single-wavelength signal or the first optical signal herein may also
include a part of the multiwavelength optical signal, as shown in FIG. 2C). In this
way, the number of microrings and a capacity of the entire optical switching fabric
apparatus increase linearly. For example, to set up an 80x80 optical switching fabric
apparatus, assuming that there are n selecting modules (which are generally corresponding
to n microrings, where, however, one selecting module may also be implemented by using
a multi-level microring, which is mainly for increasing an extinction ratio of filtering
of the microring) in each receiving device (assuming that each receiving device is
corresponding to only one receiver), the entire optical switching fabric apparatus
needs 80xn microrings.
[0072] Compared with the prior art in which an optical switching fabric apparatus is set
up by using only an SOA optical switch, it can be seen that the number of SOA optical
switches used in the prior art increases exponentially with the increase of the capacity
of the optical switching fabric apparatus.
[0073] However, by using the receiving device in the example of the foregoing embodiment,
an optical switching fabric apparatus with a large capacity can be constructed by
using a relatively small number of optical components; or, an optical switching fabric
apparatus with a larger capacity can be supported in this embodiment of the present
invention by using the same number of optical components as those used in the prior
art.
[0074] In a specific application process, by using microring filtering, it is relatively
difficult to reach a ps-level switching speed thereof. Therefore, in this embodiment
of the present invention, multiple selecting modules are used. In this way, a restriction
on a switching speed of each selecting module may be relaxed, and first optical signals
filtered by each selecting module are also allowed for overlapping in the time (for
example, the optical signal 1 and the optical signal 2 overlap in the time). Also
based on this reason (the switching speed of the selecting module is relatively slow),
a fast optical switch is connected behind each selecting module. The fast optical
switch may be implemented by using an SOA, and the switching speed may reach a ps
level. In this way, after undergoing fast on and off of fast optical switches, second
optical signals output by the fast switches do not overlap in the time, an interval
between adjacent second optical signals (for example, the optical signal 3 and the
optical signal 4) may be relatively small, and a ps level can also be reached theoretically.
[0075] It can be understood that, in this embodiment of the present invention, the number
of selecting modules is the same as the number of fast optical switches. Therefore,
the number of fast optical switches also increases linearly with the increase of a
switching capacity of the optical switching fabric apparatus, which is also advantageous
to implement an optical switching fabric apparatus with a larger capacity. In conclusion,
in this embodiment, the selecting module is designed to mainly support a larger switching
capacity, and the fast optical switch is mainly used to support relatively fast switching.
A combination of the two can implement an optical switching fabric apparatus with
a relatively large capacity and a relatively fast switching speed.
[0076] In a third embodiment, the receiving device shown in FIG. 2A and/or FIG. 2B may further
include: a receiving clock generating module 206, as shown in FIG. 2D.
[0077] The receiving clock generating module 206 is configured to generate a header clock
that is of a to-be-filtered optical burst frame and that is to be used by the selecting
module 201 and the fast optical switch 202, so that the header clock of the receiving
device is synchronous with an optical burst frame header clock sent by a sending device
in the optical switching fabric apparatus.
[0078] A specific manner may be as follows: The selecting module 201 or the fast optical
switch 202 is switched to an on state on a rising edge of the header clock of the
to-be-filtered optical burst frame, starts to filter a first optical signal corresponding
to the selecting module 201 or a second optical signal corresponding to the fast optical
switch 202, and is switched to an off state on a falling edge of the header clock
of the to-be-filtered optical burst frame, so as to complete filtering of the first
optical signal or the second optical signal. Therefore, in a general case, phases
of the header clocks that are of the to-be-filtered optical burst frames and generated
by the receiving clock generating module 206 and sent to different selecting modules
201 are different (time points separately corresponding to the rising edge and the
falling edge are different); similarly, in a general case, phases of the applicable
header clocks that are of the to-be-filtered optical burst frames and generated by
the receiving clock generating module 206 and sent to different fast optical switches
202 are also different. That is, the phase of each optical burst frame header clock
needs be obtained according to scheduling authorization information corresponding
to a scheduling module in the optical switching fabric apparatus, and then the selecting
module and the fast optical switch are controlled to filter the first optical signal
or the second optical signal at an appropriate time point.
[0079] In addition, in specific implementation, the header clock that is of the to-be-filtered
optical burst frame and generated by the receiving clock generating module 206 needs
to be sent in an allowed timeslot according to the scheduling authorization information.
Therefore, the header clock of the to-be-filtered optical burst frame may not follow
a fixed cycle.
[0080] The receiving clock generating module 206 is separately connected to each selecting
module, and the receiving clock generating module is separately connected to each
fast optical switch.
[0081] In this embodiment, the receiving clock generating module 206 mainly generates the
header clock that is of the to-be-filtered optical burst frame and that is to be used
by the selecting module and the fast optical switch module (the receiver 204 included
in the receiving device is a burst mode receiver, and a data clock is extracted by
the burst mode receiver itself). A specific implementation manner is that the receiving
clock generating module 206 receives the optical burst frame header clock and the
scheduling authorization information that are sent from the receiver, and then performs
processing in a manner in the foregoing example.
[0082] The receiver 204 in FIG. 2D receives one optical burst signal, performs optical-to-electrical
conversion on the optical burst signal, extracts and outputs service data, a received
optical burst frame header clock, and scheduling authorization information, and sends
the scheduling authorization information and the received optical burst frame header
clock to the receiving clock generating module 206.
[0083] It should be understood that a clock processing part in the optical switching fabric
apparatus that includes the receiving device may include a clock source, at least
one sending clock generating module, and at least one receiving clock generating module.
[0084] The clock source is configured to generate a synchronous clock source of the optical
switching fabric apparatus. In specific implementation, a synchronous clock source
corresponding to the optical burst signal may be sent, for example, a implementation
manner 1 of synchronous clock source shown in FIG. 2E (further, a pulse may also be
sent at intervals of a fixed number of OBs on the basis of FIG. 2E according to a
specific design of a method for transmitting scheduling authorization information,
to form a synchronous optical burst frame header clock source, which is a implementation
manner 2 of synchronous clock source shown in FIG. 2E). Apparently, a data clock used
in the entire optical switching fabric may be obtained on the basis of the synchronous
optical burst frame header clock source by means of frequency multiplication.
[0085] It can be understood that, in the foregoing synchronization manner, the optical switching
fabric apparatus (except the service clock of the service scheduling module in FIG.
3F) may use a same clock domain, so as to implement clock frequency synchronization,
and then the receiver in the receiving device in the receiving direction may receive
an optical burst signal at intervals of about 1ns by performing phase adjustment only.
Embodiment 2
[0086] FIG. 3A shows a schematic structural diagram of an optical switching fabric apparatus
according to an embodiment of the present invention. As shown in FIG. 2A, the optical
switching fabric apparatus of this embodiment includes: a sending device 300, a wavelength
broadcasting device 400, and a receiving device 200.
[0087] The sending device 300 is configured to receive an electrical signal that includes
service data, convert the electrical signal into an optical signal by using a preconfigured
wavelength, and send the optical signal to the wavelength broadcasting device 400.
[0088] The wavelength broadcasting device 400 is configured to send the optical signal to
the receiving device 200.
[0089] The receiving device 200 is configured to acquire service data in the optical signal
and output the service data.
[0090] In a specific implementation manner, the optical switching fabric apparatus further
includes a service scheduling module 100, where the sending device 300 is configured
to receive the electrical signal that includes service data and that is sent by the
service scheduling module 100. It can be understood that the service scheduling module
100 in FIG. 3A is configured to receive service data input by a user, convert the
service data into an electrical signal, and send the electrical signal to the sending
device 300.
[0091] Optionally, FIG. 3B shows a schematic structural diagram of an optical switching
fabric apparatus according to another embodiment of the present invention. As shown
in FIG. 3B, the optical switching fabric apparatus of this embodiment includes: a
service scheduling module 100, a sending device 300, a wavelength broadcasting device
400, and a receiving device 200, and further includes: a clock source 101, and a scheduling
module 102.
[0092] The clock source 101 is connected to the scheduling module 102, and the clock source
is configured to generate a synchronous clock source of the optical switching fabric
apparatus.
[0093] The scheduling module 102 is connected to the wavelength broadcasting device 400,
and is configured to perform dynamic scheduling on the optical signal of the sending
device, and configured to perform selection and reception, by using the selecting
device, in a timeslot specified by the scheduling module.
[0094] In this embodiment, a function of the scheduling module 102 is to control the service
scheduling module 100 to encapsulate service data into an electrical signal (namely,
a service cell), control the sending device 300 (for example, a transmitter) to convert
the service cell into an optical signal in a timeslot specified by the scheduling
module 102, send the optical signal to the wavelength broadcasting device 400, and
control the receiving device 200 to perform selection and reception in the timeslot
specified by the scheduling module 102.
[0095] In a third optional embodiment, the optical switching fabric apparatus in this embodiment
is shown in FIG. 3C. The optical switching fabric apparatus in this embodiment is
a detailed description of the optical switching fabric apparatus shown in FIG. 3A.
In FIG. 3C, the sending device 300 includes a transmitter 301.
[0096] The transmitter 301 is configured to convert an electrical signal into an optical
signal.
[0097] In a specific application process, one sending device may only include one transmitter.
Correspondingly, one receiving device in the optical switching fabric apparatus that
includes the sending device also only includes one receiver. In other embodiments,
one sending device may also include multiple transmitters. Correspondingly, one receiving
device in the optical switching fabric apparatus that includes the sending device
may also include multiple receivers, and the number of the transmitters and the number
of the receivers may be the same, or may be different.
[0098] In a general case, the number of the transmitters 301 and the number of the receivers
204 (as shown in FIG. 2A to FIG. 2B) in the receiving device 200 are the same. However,
there is also an exception, for example, the number of transmitters is greater than
the number of receivers, or the number of transmitters may be less than the number
of receivers. FIG. 3C, FIG. 3D, and FIG. 3E are only examples for description. The
number of transmitters in the sending device is not limited in this embodiment.
[0099] Particularly, the receiving device 200 in this embodiment may be the receiving device
in FIG. 2A or the receiving device in FIG. 2B.
[0100] In a fourth optional embodiment, the optical switching fabric apparatus in this embodiment
is shown in FIG. 3D. The optical switching fabric apparatus in this embodiment is
a detailed description of the optical switching fabric apparatus shown in FIG. 3B.
In FIG. 3D, the sending device 300 includes a transmitter 301, and further includes
a sending clock generating module 302.
[0101] The transmitter 301 is configured to convert an electrical signal sent by the service
scheduling module 100 into an optical signal.
[0102] In FIG. 3C and FIG. 3D, the number of the transmitters 301 and the number of the
receivers 204 are the same. The foregoing accompanying drawings are merely examples
for description. In other embodiments, the number of the transmitters 301 and the
number of the receivers 204 may be the same, or may be different.
[0103] The sending clock generating module 302 is configured to track the synchronous clock
source generated by the clock source 101, and generate a data clock that needs to
be sent by the transmitter 301 and an optical burst frame header clock that needs
to be sent by the transmitter 301. A specific implementation method may be as follows:
The receiver 204 in FIG. 3D receives one optical burst signal, performs optical-to-electrical
conversion on the optical burst signal, extracts a synchronous optical burst frame
header clock source and scheduling authorization information, sends the scheduling
authorization information and the synchronous optical burst frame header clock source
to the sending clock generating module 302 in the optical switching fabric apparatus,
and sends the scheduling authorization information to the service scheduling module
100. In specific implementation, the scheduling authorization information and the
synchronous optical burst frame header clock source sent by the receiver 204 to the
sending clock generating module 302 may be borne in one signal, the scheduling authorization
information and synchronous optical burst frame header clock source information may
be set in different information locations of the signal, and the sending clock generating
module 302 may extract the scheduling authorization information and the synchronous
optical burst frame header clock source information from the signal. Actually, the
service scheduling module 100 only requires the scheduling authorization information.
Because the scheduling authorization information and the synchronous optical burst
frame header clock source are borne in one signal, signals that are separately sent
by the receiver 204 to the sending clock generating module 302 and the service scheduling
module 100 and that are identified by FIG. 3D are the same. After receiving the synchronous
optical burst frame header clock source, the sending clock generating module 302 may
generate a data clock for transmission on the basis of the synchronous optical burst
frame header clock source by using frequency multiplication, and the data clock for
transmission is configured to generate a data bit stream. The sending clock generating
module 302 may further perform processing, such as frequency locking (corresponding
to manner 1 in FIG. 2E), frequency multiplication (corresponding to manner 2 in FIG.
2E), or phase shifting, on the basis of the synchronous optical burst frame header
clock source according to the scheduling authorization information, and select an
optical burst frame header clock pulse corresponding to a timeslot location (or an
optical burst sequence number) specified by the scheduling authorization information,
to form an optical burst frame header clock for transmission.
[0104] Each transmitter 301 is connected to one sending clock generating module 302; and
the sending clock generating module 302 is connected to the receiver 204 in the receiving
device of the optical switching fabric apparatus.
[0105] It can be understood that the clock that is required by the transmitter and generated
by the sending clock generating module 302 mainly includes two clocks: one is a data
clock for transmission, and the other is an optical burst frame header clock for transmission.
[0106] Based on the foregoing description, phase shifting processing needs to be performed
on the optical burst frame header clock for transmission according to the synchronous
optical burst frame header clock source received by the sending clock. A phase difference
between the optical burst frame header clock for transmission and the synchronous
optical burst frame header clock source needs to compensate a delay difference caused
by a difference of optical fiber lengths between different transmitters 301 and the
wavelength broadcasting device 400, that is, it needs to be ensured that optical burst
frame header clocks sent by different transmitters 301 to the wavelength broadcasting
device 400 are aligned.
[0107] For example, a specific implementation manner of the foregoing optical burst frame
header clock for transmission may be as follows: A sequence number is written into
an overhead of a optical burst; when starting distance measurement, the transmitter
301 records sending time of an OB of a sequence number, and then the receiver records
time when writing an optical burst of a sequence number (the receiver 204 and the
transmitter 301 are located on a same board). The difference between sending time
and receiving time is 2 times (namely a round trip) a delay from the transmitter 301
to the wavelength broadcasting device 400.
[0108] As described above, the clock source 101 is connected to the wavelength broadcasting
device 400 by using the scheduling module 102, a clock source coming from the clock
source 101 and arriving at the transmitter 301 undergoes one time of delay, and an
optical burst sent to the wavelength broadcasting device 400 by the transmitter 301
may further undergo one time of delay. Therefore, the transmitter 301 shifts a phase
of the received clock source forward by two times of delay, so that it can be ensured
that the optical burst frame header clocks are aligned when optical bursts sent by
different transmitters 301 arrive at the wavelength broadcasting device 400.
[0109] With reference to FIG. 2D, FIG. 2E, and FIG. 3D, a clock processing part in the optical
switching fabric apparatus that includes the receiving device may include a clock
source 101, at least one sending clock generating module 302, and at least one receiving
clock generating module 206.
[0110] The clock source 101 provides a synchronous clock source of an entire optical switching
fabric. In specific implementation, a synchronous clock source corresponding to an
optical burst signal may be sent, as shown in FIG. 2E.
[0111] In specific implementation, the clock source 101 sends the synchronous clock source
to the scheduling module 102, the scheduling module 102 modulates scheduling authorization
information to a single wavelength by using a synchronous optical burst frame header
clock source, to form a scheduling authorization information optical signal, and sends
the scheduling authorization information optical signal to the wavelength broadcasting
device 400, and the wavelength broadcasting device 400 sends the scheduling authorization
information optical signal to each receiving device 200.
[0112] Each receiving device 200 performs reception in a fixed time segment, and extracts
and sends the scheduling authorization information (an electrical signal) and the
synchronous optical burst frame header clock source to the sending clock generating
module 302, the receiving clock generating module, and the service scheduling module
100.
[0113] Delay differences from the wavelength broadcasting device 400 to different receiving
devices 200 are absorbed by optical burst intervals. For example, at an interconnection
line speed of 10Gbps (that is, a bit rate of an interconnection signal is 10Gbps),
the optical burst interval may be controlled within 5ns, and in this case, the delay
differences from the wavelength broadcasting device 400 to different receiving devices
200 need to be controlled within 1ns (corresponding to an optical fiber length difference
of 0.2m; to relax a restriction on the optical fiber difference, the optical burst
intervals may be increased properly, that is, the bandwidth utilization rate is decreased).
A margin is reserved according to an optical burst frame header of the receiver 204
in the receiving device 200, so that it can be ensured that the selecting module 201
and the fast optical switch 202 of the receiving device 200 operate correctly.
[0114] Correspondingly, the service scheduling module 100 of the optical switching fabric
apparatus receives input service data, and generates a scheduling application signal
according to a condition, such as input service data traffic, and sends the scheduling
application signal to the transmitter 301 of the sending device 300; and the service
scheduling module 100 encapsulates the input service data into a service cell according
to the scheduling authorization information and sends the service cell to the transmitter
301.
[0115] The scheduling module 102 of the optical switching fabric apparatus receives, from
the wavelength broadcasting device 400, scheduling application information sent by
each transmitter 301 (referring to FIG. 3E or FIG. 3G, the scheduling application
information is borne in a burst timeslot, and therefore the scheduling module 102
also needs to extract the scheduling application information in a manner that is used
by the receiving device 200, that is, scheduling application information sent by multiple
transmitters 301 needs to be extracted from multiple timeslots), generates the scheduling
authorization information according to a scheduling algorithm, generates, according
to a synchronous clock source sent by the clock source, a data clock for sending the
scheduling authorization information, bears the scheduling authorization information
on a preset wavelength to form a scheduling authorization information optical signal,
and sends the scheduling authorization information optical signal to the wavelength
broadcasting device 400.
[0116] In FIG. 3E, FIG. 3F, and FIG. 3G, there are at least two sending devices, the transmitter
301 of the sending device 300 is configured to receive a service cell (which refers
to a cell that bears service data) and a scheduling application, encapsulate the service
cell and the scheduling application into different timeslots to form sending data
for transmission, and modulate the sending data to a preset wavelength (different
transmitters use different wavelengths) to form a single-wavelength optical signal,
and send the single-wavelength optical signal to the wavelength broadcasting device
400. When the transmitter 301 sends the single-wavelength optical signal, a burst
mode may be used, as shown in FIG. 4A; or a continuous mode may be used, as shown
in FIG. 4B. When the continuous mode is used, fixed-pattern data (the fixed-pattern
data has no specific meaning, and is generally for ensuring extraction of clock information)
may be filled in intervals between valid data.
[0117] Correspondingly, the wavelength broadcasting device 400 sends multiple single-wavelength
optical signals (multiwavelength optical signal) sent by multiple transmitters 301
to each receiving device 200 (that is, each receiving device includes optical signals
(which need to be processed by the wavelength broadcasting device) sent by all the
transmitters); when dynamic scheduling (for example, when the solution is used inside
a router) is required, the wavelength broadcasting device 400 is further responsible
for combining the multiple single-wavelength optical signals sent by the multiple
transmitters 301 to form a multiwavelength optical signal, splitting the multiwavelength
optical signal into two multiwavelength optical signals by using a splitter, sending
one multiwavelength optical signal to the scheduling module 102 (the other multiwavelength
optical signa is to be sent to the receiving device), combining a scheduling authorization
information optical signal generated by the scheduling module 102 and the other multiwavelength
optical signal, and sending the combined signal to each receiving device 200, as shown
in FIG. 5C.
[0118] In FIG. 3E, FIG. 3F, and FIG. 3G, a clock tracking path is as follows: synchronous
optical burst frame header clock source - scheduling module - wavelength broadcasting
device - receiving device - receiver in the receiving device - sending clock generating
module in the sending device - transmitter in the sending device.
[0119] In an optional embodiment, as shown in FIG. 5A, the wavelength broadcasting device
400 may include: a combiner 401, an optical amplifying unit 402, and a first splitter
403.
[0120] The combiner 401 is configured to receive optical signals sent by the at least two
sending devices 300, combine the received optical signals to form a multiwavelength
optical signal, and send the multiwavelength optical signal to the optical amplifying
unit 402, where the combiner may be an optical multiplexer or a coupler.
[0121] The optical amplifying unit 402 is configured to receive the multiwavelength optical
signal sent by the combiner 401, amplify the multiwavelength optical signal, and send
an amplified multiwavelength optical signal to the first splitter 403. It can be understood
that the optical amplifying unit is mainly configured to amplify an optical signal,
and compensate optical power loss caused by an optical component between the sending
device and the receiving device; therefore, when a power budget between the sending
device and the receiving device is sufficient, the optical amplifying unit may be
omitted, and in this case, the combiner 401 is directly connected to the first splitter
403.
[0122] The first splitter 403 is configured to split the optical signal sent by the optical
amplifying unit 402 into multiple optical signals, and send each optical signal to
a corresponding receiving device 200.
[0123] It should be noted that the optical switching fabric apparatus including the wavelength
broadcasting device 400, as shown in FIG. 5A, may be in a structure shown in FIG.
3A and FIG. 3C, where the optical switching fabric apparatus does not include the
clock source 101, the scheduling module 102, the sending clock generating module 302
of the sending device, and the receiving clock generating module 206 of the receiving
device.
[0124] It can be understood that, in an optional embodiment, the wavelength broadcasting
device 400 may include: the combiner 401 and the first splitter 403, where the combiner
401 is directly connected to the first splitter 403.
[0125] In another optional embodiment, as shown in FIG. 5B or FIG. 5C, the wavelength broadcasting
device 400 may include: a combiner 401, an optical amplifying unit 402, a first splitter
403, and a second splitter 404.
[0126] The combiner 401 is configured to receive optical signals sent by the at least two
sending devices 300, combine the received optical signals to form the multiwavelength
signal, and send the multiwavelength signal to the second splitter 404.
[0127] The second splitter 404 is configured to split the multiwavelength optical signal
sent by the combiner 401 into two optical signals, where one multiwavelength optical
signal is sent to the optical amplifying unit 402, and the other multiwavelength optical
signal is sent to the scheduling module 102 of the optical switching fabric apparatus.
[0128] The optical amplifying unit 402 is configured to amplify the multiwavelength optical
signal sent by the second splitter 404, and send an amplified multiwavelength optical
signal to the first splitter 403.
[0129] The first splitter 403 is configured to receive an optical signal sent by the scheduling
module 102 and the multiwavelength optical signal of the optical amplifying unit 402,
split the optical signal of the scheduling module 102 and the multiwavelength optical
signal sent by the optical amplifying unit 402 into multiple multiwavelength optical
signals, and send each multiwavelength optical signal to a corresponding receiving
device 200.
[0130] Certainly, in specific implementation, the scheduling module 102 of the optical switching
fabric apparatus may include: one transmitter and one receiver; a simple embodiment
may be as follows: Structures of the transmitter and the receiver are the same as
or similar to corresponding parts in the sending device and the receiving device.
[0131] The scheduling module extracts scheduling application information (a timeslot in
which the scheduling application information, sent by each transmitter, is located
is preconfigured) from the multiwavelength optical signal (information included in
this multiwavelength optical signal is the same as information in the multiwavelength
optical signal sent by the second splitter to the optical amplifying unit, that is,
besides the scheduling application information, the information further includes service
data sent by each transmitter, and the scheduling module extracts only the scheduling
application information) sent by the second splitter in FIG. 5B, and a method for
receiving the scheduling application information is similar to that of the receiving
device. After obtaining the scheduling application information, the scheduling module
further obtains scheduling authorization information of each transmitter and receiver
according to a preset scheduling algorithm, sequences the scheduling authorization
information according to a preset timeslot location, uses an optical burst frame header
clock (also including a data clock that is obtained on the basis of this by frequency
multiplication, where a forming mechanism of the data clock is the same as a mechanism
of the sending data clock generating module in the sending device) of the synchronous
optical burst frame header clock source, and then sends the scheduling authorization
information by using a single wavelength (generally, the optical signal sent in the
sending device cannot change, and therefore another wavelength needs to be used for
sending), where this wavelength once again combines with the multiwavelength optical
signal that is sent by the optical amplifying unit and that includes the scheduling
application information and the service data that are sent by each transmitter, to
form a new multiwavelength optical signal, which is sent to each receiving device.
Each receiving device extracts, on the preset timeslot, the scheduling authorization
information that is sent by the scheduling module on that wavelength to perform an
operation (scheduling authorization information in different receiving devices may
be located in different timeslots, and arrangement of all these timeslots is preconfigured).
[0132] A receiving and sending part of the scheduling authorization information is similar
to a corresponding part of the sending device and the receiving device, and the scheduling
authorization information is generated according to the scheduling application information
by using a scheduling algorithm.
[0133] It should be noted that the optical switching fabric apparatus including the wavelength
broadcasting device 400, as shown in FIG. 5B, may be in a structure shown in FIG.
3B, FIG. 3D, FIG. 3E, and FIG. 3F, where the optical switching fabric apparatus includes
the clock source 101, the scheduling module 102, the sending clock generating module
302 of the sending device, and the receiving clock generating module 206 of the receiving
device, and the like.
[0134] If the optical switching fabric apparatus in the foregoing embodiment uses only a
C band light source, it is relatively easy to implement 90 waves, that is, implement
a 90x90 scale.
[0135] In an actual application, if a capacity is further increased, a range of a light
source may be extended, for example, implementing a C+L band, and in this case, the
capacity may be increased by one time. The light source may continue to be extended
in a short-distance application.
[0136] Persons of ordinary skill in the art may understand that all or some of the steps
of the method embodiments may be implemented by a program instructing relevant hardware.
The program may be stored in a computer-readable storage medium. When the program
runs, the steps of the method embodiments are performed. The foregoing storage medium
includes: any medium that can store program code, such as a ROM, a RAM, a magnetic
disk, or an optical disc.
[0137] Finally, it should be noted that the foregoing embodiments are merely intended for
describing the technical solutions of the present invention rather than limiting the
present invention. Although the present invention is described in detail with reference
to the foregoing embodiments, persons of ordinary skill in the art should understand
that they may still make modifications to the technical solutions described in the
foregoing embodiments or make equivalent replacements to some or all technical features
thereof, as long as such modifications or replacements do not cause the essence of
corresponding technical solutions to depart from the scope of the technical solutions
of the embodiments of the present invention.
1. A receiving device (200), comprising:
at least two selecting modules (201), a fast optical switch (202) connecting to each
selecting module (201), an output module (203) connecting to all fast optical switches
(202), and a receiver (204) connecting to the output module (203), wherein
the selecting module (201) is configured to receive a multiwavelength optical signal,
filter a first optical signal of a set time segment from the multiwavelength optical
signal, and send the first optical signal to the fast optical switch (202);
the fast optical switch (202) is configured to select a second optical signal from
the first optical signal filtered by the selecting module, and send the second optical
signal to the output module;
the output module (203) is configured to combine the second optical signals separately
selected by all the fast optical switches (202) into one optical burst signal, and
send the optical burst signal to the receiver (204); and
the receiver (204) is configured to perform optical-to-electrical conversion on the
optical burst signal to obtain an electrical signal, extract service data from the
electrical signal, and output the service data,
wherein the first optical signals separately output by the at least two selecting
modules (201) partly overlap in the time; and
the second optical signals output by at least two fast optical switches (202) do not
overlap in the time.
2. The receiving device (200) according to claim 1, wherein the at least two selecting
modules (201) are disposed in a serial manner.
3. The receiving device according to claim 1 or 2, further comprising an input module
(205), wherein
the input module (205) is separately connected to the at least two selecting modules
(201); and
the input module (205) is configured to receive a multiwavelength optical signal sent
by a wavelength broadcasting device (400) in a optical switching fabric apparatus,
split the multiwavelength optical signal into multiple multiwavelength optical signals,
and input each multiwavelength optical signal to a corresponding selecting module,
wherein the number of multiwavelength optical signals is the same as that of the selecting
modules.
4. The receiving device (200) according to claim 3, wherein the at least two selecting
modules (201) are disposed in a parallel manner.
5. The receiving device (200) according to claim 3 or 4, wherein the input module (205)
is a one-input multi-output splitter.
6. The receiving device (200) according to any one of claims 1 to 5, wherein:
the output module (203) is a multi-input one-output combiner.
7. The receiving device (200) according to any one of claims 1 to 6, wherein:
the selecting module (201) is a microring.
8. The receiving device (200) according to any one of claims 1 to 7, further comprising:
a receiving clock generating module (206), wherein
the receiving clock generating module (206) is configured to generate an optical burst
frame header clock that is to be used by the selecting module (201) and the fast optical
switch (202), so that the receiving device (200) is synchronous with an optical burst
frame header clock sent by a sending device (300) in the optical switching fabric
apparatus; and
the receiving clock generating module (206) is separately connected to each selecting
module (201), and the receiving clock generating module (206) is separately connected
to each fast optical switch (202).
9. The receiving device (200) according to any one of claims 1 to 8, wherein the receiving
device (200) comprises a first selecting module and a second selecting module, a first
fast optical switch connecting to the first selecting module, and a second fast optical
switch connecting to the second selecting module;
correspondingly, when the first selecting module is connected to the second selecting
module in parallel, the first selecting module splits, from the multiwavelength optical
signal, an optical signal (1) corresponding to a first time segment (1), and
the second selecting module splits, from the multiwavelength optical signal, an optical
signal (2) corresponding to a second time segment (2);
when the first selecting module is connected to the second selecting module in series,
the first selecting module splits, from the multiwavelength optical signal, the optical
signal (1) corresponding to the first time segment (1), and sends the remaining optical
signal to the second selecting module; and the second selecting module splits, from
the remaining optical signal, the optical signal (2) corresponding to the second time
segment (2);
the optical signal (1) corresponding to the first time segment partly overlaps with
the optical signal (2) corresponding to the second time segment in the time, the optical
signal (1) corresponding to the first time segment at least completely comprises an
optical signal (3) on a first selected wavelength (1) and in a first selected timeslot
(1), the optical signal (2) corresponding to the second time segment at least completely
comprises an optical signal (4) on a second selected wavelength (2) and in a second
selected timeslot (2), and the optical signal (3) on the first selected wavelength
does not overlap with the optical signal (4) on the second selected wavelength in
the time;
the first fast optical switch splits the optical signal (3) on the first selected
wavelength from the optical signal (1) corresponding to the first time segment, and
the second fast optical switch splits the optical signal (4) on the second selected
wavelength from the optical signal (2) corresponding to the second time segment; and
the output module combines the optical signal (3) on the first selected wavelength
and the optical signal (4) on the second selected wavelength into one optical burst
signal and outputs the optical burst signal to the receiver.
10. An optical switching fabric apparatus, comprising:
a sending device (300), a wavelength broadcasting device (400), and the foregoing
receiving device (200) according to any one of claims 1 to 9, wherein
the sending device (300) is configured to receive an electrical signal that comprises
service data, convert the electrical signal into an optical signal by using a preconfigured
wavelength, and send the optical signal to the wavelength broadcasting device (400);
the wavelength broadcasting device (400) is configured to send the optical signal
to the receiving device (200); and
the receiving device (200) is configured to acquire service data in the optical signal
and output the service data.
11. The apparatus according to claim 10, wherein the apparatus further comprises:
a clock source (101) and a scheduling module (102), wherein
the clock source (101) is connected to the scheduling module (102), the scheduling
module (102) is connected to the wavelength broadcasting device (400), and the clock
source (101) is configured to generate a synchronous clock source of the optical switching
fabric apparatus; and
the scheduling module (102) is configured to perform dynamic scheduling on the optical
signal of the sending device (300), and configured to perform selection and reception,
by the selecting device, in a timeslot specified by the scheduling module (102).
12. The apparatus according to claim 11, wherein the sending device (300) comprises:
a transmitter (301), configured to convert an electrical signal into an optical signal;
and
a sending clock generating module (302), configured to track the synchronous clock
source generated by the clock source (101), and generate a data clock that needs to
be sent by the transmitter (301) and an optical burst frame header clock that needs
to be sent by the transmitter (301).
13. The apparatus according to claim 10, wherein the wavelength broadcasting device (400)
comprises:
a combiner (401), an optical amplifying unit (402), and a first splitter (403), wherein
the combiner (401) is configured to receive optical signals sent by the at least two
sending devices (300), combine the received optical signals to form the multiwavelength
signal, and send the multiwavelength signal to the optical amplifying unit (402);
the optical amplifying unit (402) is configured to receive the multiwavelength optical
signal sent by the combiner, amplify the multiwavelength optical signal, and send
an amplified multiwavelength optical signal to the first splitter (403); and
the first splitter (403) is configured to split the optical signal sent by the optical
amplifying unit (402) into multiple optical signals, and send each optical signal
to a corresponding receiving device (200).
14. The apparatus according to claim 11, wherein the wavelength broadcasting device (400)
comprises:
a combiner (401), an optical amplifying unit (402), a first splitter (403), and a
second splitter (404), wherein
the combiner (401) is configured to receive optical signals sent by the at least two
sending devices (300), combine the received optical signals to form the multiwavelength
signal, and send the multiwavelength signal to the second splitter (404);
the second splitter (404) is configured to split the multiwavelength optical signal
sent by the combiner (401) into two optical signals, wherein one multiwavelength optical
signal is sent to the optical amplifying unit (402), and the other multiwavelength
optical signal is sent to the scheduling module (102) of the optical switching fabric
apparatus;
the optical amplifying unit (402) is configured to send, to the first splitter (403),
the multiwavelength optical signal sent by the second splitter (404); and
the first splitter (403) is configured to receive an optical signal sent by the scheduling
module (102) and the multiwavelength optical signal of the optical amplifying unit
(402), split the optical signal of the scheduling module (102) and the multiwavelength
optical signal sent by the optical amplifying unit (402) into multiple multiwavelength
optical signals, and send each multiwavelength optical signal to a corresponding receiving
device (200).
1. 1. Empfangsvorrichtung (200), umfassend:
mindestens zwei Auswahlmodule (201), einen mit jedem Auswahlmodul (201) verbundenen
schnellen optischen Schalter (202), ein mit allen schnellen optischen Schaltern (202)
verbundenes Ausgabemodul (203) und einen mit dem Ausgabemodul (203) verbundenen Empfänger
(204), wobei
das Auswahlmodul (201) konfiguriert ist, um ein optisches Mehrwellenlängensignal zu
empfangen, ein erstes optisches Signal eines eingestellten Zeitsegments aus dem optischen
Mehrwellenlängensignal zu filtern und das erste optische Signal an den schnellen optischen
Schalter (202) zu senden;
der schnelle optische Schalter (202) konfiguriert ist, um ein zweites optisches Signal
aus dem ersten optischen Signal auszuwählen, das durch das Auswahlmodul gefiltert
wird, und das zweite optische Signal an das Ausgabemodul zu senden;
das Ausgabemodul (203) konfiguriert ist, um die zweiten optischen Signale, die getrennt
von allen schnellen optischen Schaltern (202) ausgewählt wurden, zu einem optischen
Burstsignal zu kombinieren und das optische Burstsignal an den Empfänger (204) zu
senden; und
der Empfänger (204) konfiguriert ist, um eine optisch-elektrische Umwandlung des optischen
Burstsignals durchzuführen, um ein elektrisches Signal zu erhalten, Dienstdaten aus
dem elektrischen Signal zu extrahieren und die Dienstdaten auszugeben,
wobei die ersten optischen Signale, die von den mindestens zwei Auswahlmodulen (201)
getrennt ausgegeben werden, sich teilweise zeitlich überschneiden; und
die zweiten optischen Signale, die von mindestens zwei schnellen optischen Schaltern
(202) ausgegeben werden, sich zeitlich nicht überschneiden.
2. Empfangsvorrichtung (200) nach Anspruch 1, wobei die mindestens zwei Auswahlmodule
(201) seriell angeordnet sind.
3. Empfangsvorrichtung nach Anspruch 1 oder 2, ferner umfassend ein Eingabemodul (205),
wobei
das Eingabemodul (205) getrennt mit den mindestens zwei Auswahlmodulen (201) verbunden
ist; und
das Eingabemodul (205) konfiguriert ist, um ein optisches Mehrwellenlängensignal zu
empfangen, das von einer Wellenlängenübertragungsvorrichtung (400) in einer optischen
Schaltstrukturvorrichtung gesendet wird, das optische Mehrwellenlängensignal in mehrere
optische Mehrwellenlängensignale aufzuteilen und jedes optische Mehrwellenlängensignal
in ein entsprechendes Auswahlmodul einzugeben, wobei die Anzahl der optischen Mehrwellenlängensignale
gleich der Anzahl der Auswahlmodule ist.
4. Empfangsvorrichtung (200) nach Anspruch 3, wobei die mindestens zwei Auswahlmodule
(201) parallel angeordnet sind.
5. Empfangsvorrichtung (200) nach Anspruch 3 oder 4, wobei das Eingabemodul (205) ein
Splitter mit einer Eingabe und mehreren Ausgaben ist.
6. Empfangsvorrichtung (200) nach einem der Ansprüche 1 bis 5, wobei: das Ausgabemodul
(203) ein Kombinator mit mehreren Eingaben und einer Ausgabe ist.
7. Empfangsvorrichtung (200) nach einem der Ansprüche 1 bis 6, wobei: das Auswahlmodul
(201) ein Mikroring ist.
8. Empfangsvorrichtung (200) nach einem der Ansprüche 1 bis 7, ferner umfassend:
ein empfangendes Takterzeugungs-Modul (206), wobei
das empfangende Takterzeugungs-Modul (206) konfiguriert ist, um einen optischen Burst-Frameheader-Takt
zu erzeugen, der von dem Auswahlmodul (201) und dem schnellen optischen Schalter (202)
verwendet werden soll, sodass die Empfangsvorrichtung (200) mit einem optischen Burst-Frameheader-Takt
synchron ist, der von einer Sendevorrichtung (300) in der optischen Schaltstrukturvorrichtung
gesendet wird; und
das empfangende Takterzeugungs-Modul (206) getrennt mit jedem Auswahlmodul (201) verbunden
ist, und das empfangende Takterzeugungs-Modul (206) getrennt mit jedem schnellen optischen
Schalter (202) verbunden ist.
9. Empfangsvorrichtung (200) nach einem der Ansprüche 1 bis 8, wobei die Empfangsvorrichtung
(200) ein erstes Auswahlmodul und ein zweites Auswahlmodul, einen ersten schnellen
optischen Schalter, der mit dem ersten Auswahlmodul verbunden ist, und einen zweiten
schnellen optischen Schalter, der mit dem zweiten Auswahlmodul verbunden ist, umfasst;
dementsprechend, wenn das erste Auswahlmodul parallel mit dem zweiten Auswahlmodul
verbunden ist, teilt das erste Auswahlmodul ein optisches Signal (1) von dem optischen
Mehrwellenlängensignal ab, das einem ersten Zeitsegment (1) entspricht, und
das zweite Auswahlmodul teilt ein optisches Signal (2) von dem optischen Mehrwellenlängensignal
ab, das einem zweiten Zeitsegment (2) entspricht;
wenn das erste Auswahlmodul mit dem zweiten Auswahlmodul seriell verbunden ist, teilt
das erste Auswahlmodul das dem ersten Zeitsegment (1) entsprechende optische Signal
(1) von dem optischen Mehrwellenlängensignal ab und sendet das verbleibende optische
Signal an das zweite Auswahlmodul; und das zweite Auswahlmodul teilt, von dem verbleibenden
optischen Signal, das dem zweiten Zeitsegment (2) entsprechende optische Signal (2)
ab;
das dem ersten Zeitsegment entsprechende optische Signal (1) überschneidet sich zeitlich
teilweise mit dem dem zweiten Zeitsegment entsprechenden optischen Signal (2), das
dem ersten Zeitabschnitt entsprechende optische Signal (1) umfasst zumindest vollständig
ein optisches Signal (3) auf einer ersten ausgewählten Wellenlänge (1) und in einem
ersten ausgewählten Zeitschlitz (1), das dem zweiten Zeitabschnitt entsprechende optische
Signal (2) umfasst zumindest vollständig ein optisches Signal (4) auf einer zweiten
ausgewählten Wellenlänge (2) und in einem zweiten ausgewählten Zeitschlitz (2), und
das optische Signal (3) auf der ersten ausgewählten Wellenlänge überschneidet sich
nicht zeitlich mit dem optischen Signal (4) auf der zweiten ausgewählten Wellenlänge;
der erste schnelle optische Schalter teilt das optische Signal (3) auf der ersten
ausgewählte Wellenlänge von dem dem ersten Zeitsegment entsprechenden optischen Signal
(1) ab, und der zweite schnelle optische Schalter teilt das optische Signal (4) auf
der zweiten ausgewählten Wellenlänge von dem dem zweiten Zeitsegment entsprechenden
optischen Signal (2) ab; und
das Ausgabemodul kombiniert das optische Signal (3) auf der ersten ausgewählten Wellenlänge
und das optische Signal (4) auf der zweiten ausgewählten Wellenlänge in einem optischen
Burstsignal und gibt das optische Burstsignal an den Empfänger aus.
10. Optische Schaltstrukturvorrichtung, umfassend:
eine Sendevorrichtung (300), eine Wellenlängenübertragungsvorrichtung (400) und die
vorgenannte Empfangsvorrichtung (200) nach einem der Ansprüche 1 bis 9, wobei
die Sendevorrichtung (300) konfiguriert ist, um ein elektrisches Signal zu empfangen,
das Dienstdaten enthält, das elektrische Signal in ein optisches Signal unter Verwendung
einer vorkonfigurierten Wellenlänge umzuwandeln und das optische Signal an die Wellenlängenübertragungsvorrichtung
(400) zu senden;
die Wellenlängenübertragungsvorrichtung (400) konfiguriert ist, um das optische Signal
an die Empfangsvorrichtung (200) zu senden; und
die Empfangsvorrichtung (200) konfiguriert ist, um Dienstdaten in dem optischen Signal
zu erfassen und die Dienstdaten auszugeben.
11. Vorrichtung nach Anspruch 10, wobei die Vorrichtung ferner umfasst:
eine Taktquelle (101) und ein Planungsmodul (102), wobei
die Taktquelle (101) mit dem Planungsmodul (102) verbunden ist, das Planungsmodul
(102) mit der Wellenlängenübertragungsvorrichtung (400) verbunden ist, und die Taktquelle
(101) konfiguriert ist, um eine synchrone Taktquelle der optischen Schaltstrukturvorrichtung
zu erzeugen; und
das Planungsmodul (102) konfiguriert ist, um eine dynamische Planung des optischen
Signals der Sendevorrichtung (300) durchzuführen, und konfiguriert ist, um die Auswahl
und den Empfang, durch die Auswahlvorrichtung, in einem von dem Planungsmodul (102)
festgelegten Zeitschlitz durchzuführen.
12. Vorrichtung nach Anspruch 11, wobei die Sendevorrichtung (300) umfasst: einen Sender
(301), der konfiguriert ist, um ein elektrisches Signal in ein optisches Signal umzuwandeln;
und ein sendendes Takterzeugungs-Modul (302), das konfiguriert ist, um die von der
Taktquelle (101) erzeugte synchrone Taktquelle zu verfolgen und einen Datentakt, der
von dem Sender (301) gesendet werden muss, und einen optischen Burst-Frameheader-Takt,
der von dem Sender (301) gesendet werden muss, zu erzeugen.
13. Vorrichtung nach Anspruch 10, wobei die Wellenlängenübertragungsvorrichtung (400)
umfasst:
einen Kombinator (401), eine optische Verstärkungseinheit (402) und einen ersten Splitter
(403), wobei
der Kombinator (401) konfiguriert ist, um optische Signale zu empfangen, die von den
mindestens zwei Sendevorrichtungen (300) gesendet werden, die empfangenen optischen
Signale zu kombinieren, um das Mehrwellenlängensignal zu bilden, und das Mehrwellenlängensignal
an die optische Verstärkungseinheit (402) zu senden;
die optische Verstärkungseinheit (402) konfiguriert ist, um das von dem Kombinator
gesendete optische Mehrwellenlängensignal zu empfangen, das optische Mehrwellenlängensignal
zu verstärken und ein verstärktes optisches Mehrwellenlängensignal an den ersten Splitter
(403) zu senden; und
der erste Splitter (403) konfiguriert ist, um das von der optischen Verstärkungseinheit
(402) gesendete optische Signal in mehrere optische Signale aufzuteilen und jedes
optische Signal an eine entsprechende Empfangsvorrichtung (200) zu senden.
14. Vorrichtung nach Anspruch 11, wobei die Wellenlängenübertragungsvorrichtung (400)
umfasst:
einen Kombinator (401), eine optische Verstärkungseinheit (402), einen ersten Splitter
(403) und einen zweiten Splitter (404), wobei
der Kombinator (401) konfiguriert ist, um optische Signale zu empfangen, die von den
mindestens zwei Sendevorrichtungen (300) gesendet werden, die empfangenen optischen
Signale zu kombinieren, um das Mehrwellenlängensignal zu bilden, und das Mehrwellenlängensignal
an den zweiten Splitter (404) zu senden;
der zweite Splitter (404) konfiguriert ist, um das von dem Kombinator (401) gesendete
optische Mehrwellenlängensignal in zwei optische Signale aufzuteilen, wobei ein optisches
Mehrwellenlängensignal an die optische Verstärkungseinheit (402) gesendet wird und
das andere optische Mehrwellenlängensignal an das Planungsmodul (102) der optischen
Schaltstrukturvorrichtung gesendet wird;
die optische Verstärkungseinheit (402) konfiguriert ist, um das von dem zweiten Splitter
(404) gesendete optische Mehrwellenlängensignal an den ersten Splitter (403) zu senden;
und
der erste Splitter (403) konfiguriert ist, um ein von dem Planungsmodul (102) gesendetes
optisches Signal und das optische Mehrwellenlängensignal der optischen Verstärkungseinheit
(402) zu empfangen, das optische Signal des Planungsmoduls (102) und das von der optischen
Verstärkungseinheit (402) gesendete optische Mehrwellenlängensignal in mehrere optische
Mehrwellenlängensignale aufzuteilen und jedes optische Mehrwellenlängensignal an eine
entsprechende Empfangsvorrichtung (200) zu senden.
1. Dispositif de réception (200), comprenant :
au moins deux modules de sélection (201), un commutateur optique rapide (202) se connectant
à chaque module de sélection (201), un module de sortie (203) se connectant à tous
les commutateurs optiques rapides (202), et un récepteur (204) se connectant au module
de sortie (203), dans lequel le module de sélection (201) est configuré pour recevoir
un signal optique à longueurs d'onde multiples, filtrer un premier signal optique
d'un segment de temps prédéterminé à partir du signal optique à longueurs d'onde multiples,
et envoyer le premier signal optique au commutateur optique rapide (202) ;
le commutateur optique rapide (202) est configuré pour sélectionner un second signal
optique à partir du premier signal optique filtré par le module de sélection, et envoyer
le second signal optique au module de sortie ;
le module de sortie (203) est configuré pour combiner les seconds signaux optiques
séparément sélectionnés par tous les commutateurs optiques rapides (202) en un signal
de salve optique, et envoyer le signal de salve optique au récepteur (204) ; et
le récepteur (204) est configuré pour réaliser une conversion optique-électrique sur
le signal de salve optique pour obtenir un signal électrique, extraire des données
de service à partir du signal électrique, et produire en sortie les données de service,
dans lequel les premiers signaux optiques séparément produits en sortie par les au
moins deux modules de sélection (201) se chevauchent partiellement dans le temps ;
et
les seconds signaux optiques produits en sortie par au moins deux commutateurs optiques
rapides (202) ne se chevauchent pas dans le temps.
2. Dispositif de réception (200) selon la revendication 1, dans lequel les au moins deux
modules de sélection (201) sont disposés en série.
3. Dispositif de réception selon la revendication 1 ou 2, comprenant en outre un module
d'entrée (205), dans lequel
le module d'entrée (205) est séparément connecté aux au moins deux modules de sélection
(201) ; et
le module d'entrée (205) est configuré pour recevoir un signal optique à longueurs
d'onde multiples envoyé par un dispositif de diffusion à longueur d'onde (400) dans
un appareil à matrice de commutation optique, diviser le signal optique à longueurs
d'onde multiples en de multiples signaux optiques à longueurs d'onde multiples, et
entrer chaque signal optique à longueurs d'onde multiples dans un module de sélection
correspondant, dans lequel le nombre de signaux optiques à longueurs d'onde multiples
est le même que celui des modules de sélection.
4. Dispositif de réception (200) selon la revendication 3, dans lequel les au moins deux
modules de sélection (201) sont disposés de manière parallèle.
5. Dispositif de réception (200) selon la revendication 3 ou 4, dans lequel le module
d'entrée (205) est un diviseur à entrée unique-sorties multiples.
6. Dispositif de réception (200) selon l'une quelconque des revendications 1 à 5, dans
lequel :
le module de sortie (203) est un combineur à entrées multiples-sortie unique.
7. Dispositif de réception (200) selon l'une quelconque des revendications 1 à 6, dans
lequel :
le module de sélection (201) est un micro-anneau.
8. Dispositif de réception (200) selon l'une quelconque des revendications 1 à 7, comprenant
en outre :
un module de génération d'horloge de réception (206), dans lequel
le module de génération d'horloge de réception (206) est configuré pour générer une
horloge d'en-tête de trame de salve optique qui est destinée à être utilisée par le
module de sélection (201) et le commutateur optique rapide (202), pour que le dispositif
de réception (200) soit synchrone avec une horloge d'en-tête de trame de salve optique
envoyée par un dispositif d'envoi (300) dans l'appareil à matrice de commutation optique
; et
le module de génération d'horloge de réception (206) est séparément connecté à chaque
module de sélection (201), et le module de génération d'horloge de réception (206)
est séparément connecté à chaque commutateur optique rapide (2C12).
9. Dispositif de réception (200) selon l'une quelconque des revendications 1 à 8, dans
lequel le dispositif de réception (200) comprend un premier module de sélection et
un second module de sélection, un premier commutateur optique rapide se connectant
au premier module de sélection, et un second commutateur optique rapide se connectant
au second module de sélection ;
de façon correspondante, lorsque le premier module de sélection est connecté au second
module de sélection en parallèle, le premier module de sélection divise, à partir
du signal optique à longueurs d'onde multiples, un signal optique (1) correspondant
à un premier segment de temps (1), et
le second module de sélection divise, à partir du signal optique à longueurs d'onde
multiples, un signal optique (2) correspondant à un second segment de temps (2) ;
lorsque le premier module de sélection est connecté au second module de sélection
en série, le premier module de sélection divise, à partir du signal optique à longueurs
d'onde multiples, le signal optique (1) correspondant au premier segment de temps
(1), et envoie le signal optique restant au second module de sélection ; et le second
module de sélection divise, à partir du signal optique restant, le signal optique
(2) correspondant au second segment de temps (2) ;
le signal optique (1) correspondant au premier segment de temps chevauche partiellement
le signal optique (2) correspondant au second segment de temps dans le temps, le signal
optique (1) correspondant au premier segment de temps comprend au moins complètement
un signal optique (3) sur une première longueur d'onde sélectionnée (1) et dans un
premier intervalle de temps sélectionné (1), le signal optique (2) correspondant au
second segment de temps comprend au moins complètement un signal optique (4) sur une
seconde longueur d'onde sélectionnée (2) et dans un second intervalle de temps sélectionné
(2), et le signal optique (3) sur la première longueur d'onde sélectionnée ne chevauche
pas le signal optique (4) sur la seconde longueur d'onde sélectionnée dans le temps
;
le premier commutateur optique rapide divise le signal optique (3) sur la première
longueur d'onde sélectionnée à partir du signal optique (1) correspondant au premier
segment de temps, et le second commutateur optique rapide divise le signal optique
(4) sur la seconde longueur d'onde sélectionnée à partir du signal optique (2) correspondant
au second segment de temps ; et
le module de sortie combine le signal optique (3) sur la première longueur d'onde
sélectionnée et le signal optique (4) sur la seconde longueur d'onde sélectionnée
en un signal de salve optique et produit en sortie le signal de salve optique au récepteur.
10. Appareil à matrice de commutation optique, comprenant :
un dispositif d'envoi (300), un dispositif de diffusion à longueur d'onde (400), et
le dispositif de réception précédent (200) selon l'une quelconque des revendications
1 à 9, dans lequel
le dispositif d'envoi (300) est configuré pour recevoir un signal électrique qui comprend
des données de service, convertir le signal électrique en un signal optique en utilisant
une longueur d'onde préconfigurée, et envoyer le signal optique au dispositif de diffusion
à longueur d'onde (400) ;
le dispositif de diffusion à longueur d'onde (400) est configuré pour envoyer le signal
optique au dispositif de réception (200) ; et
le dispositif de réception (200) est configuré pour acquérir des données de service
dans le signal optique et produire en sortie les données de service.
11. Appareil selon la revendication 10, dans lequel l'appareil comprend en outre :
une source d'horloge (101) et un module de programmation (102), dans lequel
la source d'horloge (101) est connectée au module de programmation (102), le module
de programmation (102) est connecté au dispositif de diffusion à longueur d'onde (400),
et la source d'horloge (101) est configurée pour générer une source d'horloge synchrone
de l'appareil à matrice de commutation optique ; et
le module de programmation (102) est configuré pour réaliser une programmation dynamique
sur le signal optique du dispositif d'envoi (300), et configuré pour réaliser une
sélection et une réception, par le dispositif de sélection, dans un intervalle de
temps spécifié par le module de programmation (102).
12. Appareil selon la revendication 11, dans lequel le dispositif d'envoi (300) comprend
:
un transmetteur (301), configuré pour convertir un signal électrique en un signal
optique ; et
un module de génération d'horloge d'envoi (302), configuré pour suivre la source d'horloge
synchrone générée par la source d'horloge (101), et générer une horloge de données
qui doit être envoyée par le transmetteur (301) et une horloge d'en-tête de trame
de salve optique qui doit être envoyée par le transmetteur (301).
13. Appareil selon la revendication 10, dans lequel le dispositif de diffusion à longueur
d'onde (400) comprend :
un combineur (401), une unité d'amplification optique (402), et un premier diviseur
(403), dans lequel
le combineur (401) est configuré pour recevoir des signaux optiques envoyés par les
au moins deux dispositifs d'envoi (300), combiner les signaux optiques reçus pour
former le signal à longueurs d'onde multiples, et envoyer le signal à longueurs d'onde
multiples à l'unité d'amplification optique (402) ;
l'unité d'amplification optique (402) est configurée pour recevoir le signal optique
à longueurs d'onde multiples envoyé par le combineur, amplifier le signal optique
à longueurs d'onde multiples, et envoyer un signal optique à longueurs d'onde multiples
amplifié au premier diviseur (403) ; et
le premier diviseur (403) est configuré pour diviser le signal optique envoyé par
l'unité d'amplification optique (402) en de multiples signaux optiques, et envoyer
chaque signal optique à un dispositif de réception correspondant (200).
14. Appareil selon la revendication 11, dans lequel le dispositif de diffusion à longueur
d'onde (400) comprend :
un combineur (401), une unité d'amplification optique (402), un premier diviseur (403),
et un second diviseur (404), dans lequel
le combineur (401) est configuré pour recevoir des signaux optiques envoyés par les
au moins deux dispositifs d'envoi (300), combiner les signaux optiques reçus pour
former le signal à longueurs d'onde multiples, et envoyer le signal à longueurs d'onde
multiples au second diviseur (404) ;
le second diviseur (404) est configuré pour diviser le signal optique à longueurs
d'onde multiples envoyé par le combineur (401) en deux signaux optiques, dans lequel
un signal optique à longueurs d'onde multiples est envoyé à l'unité d'amplification
optique (402), et l'autre signal optique à longueurs d'onde multiples est envoyé au
module de programmation (102) de l'appareil à matrice de commutation optique ;
l'unité d'amplification optique (402) est configurée pour envoyer, au premier diviseur
(403), le signal optique à longueurs d'onde multiples envoyé par le second diviseur
(404) ; et
le premier diviseur (403) est configuré pour recevoir un signal optique envoyé par
le module de programmation (102) et le signal optique à longueurs d'onde multiples
de l'unité d'amplification optique (402), diviser le signal optique du module de programmation
(102) et le signal optique à longueurs d'onde multiples envoyé par l'unité d'amplification
optique (402) en de multiples signaux optiques à longueurs d'onde multiples, et envoyer
chaque signal optique à longueurs d'onde multiples à un dispositif de réception correspondant
(200).